Fig. 1: Reported low oxidation-state group 2 compounds and related metal–metal bonded complexes.
From: Open questions in low oxidation state group 2 chemistry
Magnesium(I) systems (a, b) and a laplacian depiction of the non-nuclear attractor in the Mg–Mg bond of one of these (c, reprinted with permission from ref. 5. Copyright 2011 American Chemical Society), beryllium(0) and beryllium(I) complexes (d, e), a calcium(I) complex (f), a polyhedral aluminium(I) hydride cluster (g) and an unsupported Mn-Mg bonded complex (h) (Ar = bulky aryl, R = alkyl).
